What are the factors(উৎপাদক) of a³ - 7a + 6?

a³ - 7a + 6 = a³ - a² + a² - a - 6a + 6 = a²(a - 1) + a(a -1) - 6(a - 1) = (a - 1)(a² + a - 6) = ( a - 1)(a² + 3a - 2a - 6) = (a - 1){a(a + 3) - 2(a + 3)} = (a - 1)(a + 3)(a - 2)